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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e8df831fced9804c9a61be4f07aa6e9e027b7d0a6ea1124d47f384e364d5b7' 
  AND token = '0N03KrFVnORD8ngkNxU/t3SrrQJ4xggePaUh1j9zUEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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