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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2611df9f83172b2b9add516b2db90ef323b3b63311bcd58582edcb075cb95cf5' 
  AND token = 'y+e5hc+YgvdMAf/yvVj29jNYcOW0rXsT9J32zEj7cbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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