SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f762ea2776ac4ac28129e3775294c39bc870a5a13787c6b7b00e927b8d5675f' 
  AND token = 'Y67vR3kj8Eiu6NItNX55VJ3sBLgyK1NILOz/+QYZSxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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