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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c241a65aff5b323b348d83da1725e7e9aff823928ad752a8c4a9bb759655cc6' 
  AND token = 'ind+t0QNTFrJX867zqtwt24wbLKc4SZK0/tSlRzz2rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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