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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5883e895753db628628699e54e4a9441e5fc780c5932fad6f24b20f2918961' 
  AND token = '1T0ME+MPtoIg/OAGASRgbURuM9z2sZIzI9TOyK08N48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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