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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af546fbbf7a6a140e4b54ab6caa2b4f4765710f5b586098a57737c830f777fd' 
  AND token = 'kaVUqoFFWDn3Zz8OeJMyRLehxdjWEVfXV2eSfd2fYFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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