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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5813cfcd98955b5007a9b243588fa1a8c627a1aca66a4e8567c99a2d930c4630' 
  AND token = 'GIm1K+DfLsnNCu2rNNXaUGQtN164M8Y8HzR5w10Jh7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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