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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc919fd66d39a85447ebf2f864fa218b712c4efbb7798af5eb9213e19a3e6ce1' 
  AND token = 'puufEIdWvJM68vkCQDTt2tvsE+R3/YMR4HxQxqr/4oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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