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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6308856b4a169d09279c1d4e04ea05daac7aca56e12094c46ef789c55d5bcbd' 
  AND token = 'bJdzYj67T6Zxmh5EpaGKpZLy7aIG2/2uYyKYbyedmuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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