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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0de9727a014a43ad165f74c3ea0e09c2b4ef11a83410a8704d5511ee9d65f8' 
  AND token = 'MOQFPl1u1Qy5iynkD9kOnPqA8Y6OHfYj6XsuAMXqWts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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