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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23a18930efb652a15bf4036ad0ca7d5aab97da2cea3947178a97fcdedc52b3e' 
  AND token = 'JSBWBj0yX9swctbxcvNb7Ssd3FPlQLt//IC7Q7UFDSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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