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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2309d7ff901bace5e94d1cac7fb9e54db07de308cb64bc0257593b1fb044a9c3' 
  AND token = 'srrHxyyC3CcAO6yRGMw9YSCMjiESw/zAI70P4gJBGZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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