SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ea8951540cd1dc32f051bf7da9201c5b34db8db21641c06a6a52746ac9f6d3' 
  AND token = '+v1wBHeII4H8TpGZktZD+cQ923vSXJqfVKBUejEAwzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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