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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6431a61ebc607da421d944dd85f1028aea8d4a3bc2671966766f4f1bddcdef6e' 
  AND token = '87QbhMf+9SwVwqPTqXl6cKMDB4hYiFIgan5eTOY2K3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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