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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755ad3a72b1f12eb5c21c32e3be81753fccf60cd587e9f7200c6c09bc88c2420' 
  AND token = 'KjJd5l4vck4iduqVjnbR9lXRi3cNcwt7hO4WT1ERpIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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