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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e253f8c2bf1a3e16f511066f713fc96453b2702cf7e7a87fe3b9b855808cce' 
  AND token = 'glELFyHyy6LXG7+Vo2B4m8+TtqYeVq8KgAi0EZQJBbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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