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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dcf3823db47771e4c0d86b8805e6d89e75056d19bd578d24a5572b538e0ee7' 
  AND token = 'I+fA7btm33u3ypUdupKkXWtdsp5ws5S1A05v7rHl2oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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