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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a8f89d805e63a3c612dda5c94b7c773ad64f5ddf923d351c005868ffccaaff' 
  AND token = 'IHrdpuvOcJ6WcU+ChX5gI6nfp/mEVW4fMiHqe2sGzkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}