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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea6beb059537ad820e4ed4a71f59ab57f5bad4bc7f9f1e547740fca715d8105' 
  AND token = 'igN5q7HoAm6NyM5CKUE30PSKEqoLyxQal3+aWF25bTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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