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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81160aa0054f0b60f413033a9facb6c5fdc1ac9283ba847efda9b3c11571bfe9' 
  AND token = '15lEISL+IW0GlAzEz6wVRkcYbTf9fachtSKiGX4QBSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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