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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9588891d5df18c6a20b37f9a2cd2ddcad4c41f29fb3a46dab0c7d26a5f99f57f' 
  AND token = 'lCe2lSBMxjZcwJSg7d/K9nedteSltVYC0b58otuXtQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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