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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35067b40274900bcc8b363f13db570964d6348ef154378bb7501fa9ce53e827' 
  AND token = 'TumHKFSRU/pBVZAarPIx/36B61I1iTXeInEWn777dWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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