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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce739cae0985ded1172a04cccaaf7cb9b36c757648646dd2b22bb7920a8c3bbe' 
  AND token = '7QT8qxFlhMc/XIdp1vGPzLUIBZ4iglzpgEjh7a5zPoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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