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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56738b3d383b132ee3355c6f585ced4a80f73acfe42f67c9c511ca1a0ab44a42' 
  AND token = 'szmsnWt6sI9z5cBldOFSU2QjCrmSfL92OubDBZomw0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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