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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b77460b9faca0e918cf26e07bae8cfded862e60afefd80c6fd54c0119efb458' 
  AND token = 'dJTjUP2tlSrRxXZwGClI996oFotBOZW1P5vWlk/EGzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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