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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6c1dcb3dc6714430256ee3fa00ac742d0277039cc7ed876cf55c863c84e061' 
  AND token = '33wkE0JruYJV8RJYSdFVCID2Z6BSb1zCELP/QMl5b94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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