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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460a0f852f7939f6158ec05bf4ff62144882a92cb6776a96c93f1893491fdd8c' 
  AND token = '5dgx/F51Qx3uZtiecFY0P8wUBqL86oxFwPyC3qbtvfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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