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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dba45c89f3971ae5638025042b5e44a05842bab2fb47f29e1bb29612a54577' 
  AND token = 'xfE6Q+fMytq0ssckrRS1LKDGn3L5Gnex9KCam1MFixw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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