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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36054bfd7e41567600568ae939ee694b2b75e46d2beaed23a730b40e1932a9d8' 
  AND token = '8SHkI3r2qY9V9eGqQP4WGsK/gKGbllByoDw1sIlpwsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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