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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5dcced8e3bc99f0c40e0534702f55e4b4275facc9840cdeb4034214912111f' 
  AND token = 'FIBsp2Rc43j1YQJo8UKdzdSLP7eoSUPwmu9+5hz0ZjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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