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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adec262fa155600bd55b7f1c0c3e7a88365251d3de9aea23c3e9452e0227498' 
  AND token = 'RPT8M7MeoQm7cMoqKGIGGklA9EUu9ljcg5Or9FSQ014=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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