SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04410fb72118d9fc3df42586c74d363816ebc15f5e306685290559486bbc8c9d' 
  AND token = 'bfZvj74GQ+XhsWSjOCr+Kh8jBseHp8c40h/v4ZkffKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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