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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef99f26f9d27473f664eee63b31a6fbd57246922be7e8cf806d5b1f44e341dbb' 
  AND token = 'Pclv+zFCUc+4ewOuZJ7+NMif92BmikgH3fjjp/J7kf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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