SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19d0656e1192a1503ab2749d8d30b79f587f0fd59ceb1c06a171fc89ddd7a78' 
  AND token = 'UF6n/JJQO/xAZyjm6qSVXnnAyq5h32UNslYF8WkvAm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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