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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020d47a268db02590a736ac7f252c929a18915feea9bdd4d1f4d3246ffd1a84b' 
  AND token = 'CJu6jwUZbOLEN7iLc3edp1wAPzejzlOxwM0wyY2tiic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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