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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7a1e3d824c1fb6c5db1b4848d85737baf0806bfa93561e88d50a700d24e21f' 
  AND token = 'XpzBQK7IlBNHLL1nVk8fYy6WOdTH7xf3IHTnTR0bmZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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