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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efac3d32cf609febf4763395259919d950f9c6774b5985280c2c7a928c287f7a' 
  AND token = 'g+QG1XtdQMRbRBABDlMxbnxZD8MTA4XzH22vULzUXY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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