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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a44539924c3cca9f22e46b76d829e82ec63936c807a10e66ee858bcafd5b5ee' 
  AND token = 'DWrUi1YtcJETHAUROjEYJQzrSmem1n++kJ7v2ywuM4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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