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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2331d455145ff0cd9e842c2ff439f7d50b574c7e5b8636e174c789e4dbb235' 
  AND token = 'dFW5dnvH35bXlHe3pW0dxUWtbx6lF73581Y0DBJpzq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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