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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1f55063add22acdaf8c383185b52521d2211e230a136ed64166b8813787f18' 
  AND token = 'qyfBQUqa366yM+o4IoxQXG/sCDIyqGeG+OC7troQFy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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