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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cadd4711da9b92c2e77de03f1bb0642a661767b59724156de69f77fc51a1de' 
  AND token = 'q4mUWSOP8PsFN3TH7/RsHdV7K5iPTyvv+ukd0S9aF6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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