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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb124a7490ef48d2c6795de5f2957ef50304b4f6ad286ea688237a9f0c705b0e' 
  AND token = 'ddu4/iLHUwL6uH8629+4u6aabmFUI1H0Sn3iVpm+9SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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