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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e228a8b73a4936511752511350f1e5cb70fe56dfd5cc22acbc3b15a5ce6e7df' 
  AND token = '/ABQuL+lTIniEuTVVBI9X0zMpPYTnKvtOp8pnYw5TZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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