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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1373ae01c95b4a2ec571cd32fb0a98145df1a77b49d4800cbfd1fd1c3edeff7e' 
  AND token = 'PQV8dAFCmrgxKlvwDc8wws32OYel6AiV4jdj4VZj+sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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