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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b864c489b94956c20a3b837a797eafb77d1f4a191b31e0ea86f12d705b1796' 
  AND token = '/gQ1aTJI9sv+9EOwkQZNgRWRpHULJZ2f/D21iyphDi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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