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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2873ad6c5a0d7a9dc8d1151d485c79fa1e471c2ecea13942a068fe557b6312' 
  AND token = 'C7rR08GVx2v1pyBBrvyUJNyq4gOQd7LRdqhjRHIcBSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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