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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b868255712c7debf90484caef3de29ed756c290396b881cb17f2774a29176527' 
  AND token = '4ocv5i0OoyHojihau2tTr14DPPBKoZQO/zzsBepSRqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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