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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b6bc580c953b2fc73ccc3efbd36d25f88f21e19f739ad21ccf5b46295d5014' 
  AND token = 'zgk1sNnlUMXftcLsrIyqNN5AQm/7FjyK8ldY4aBmVNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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