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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16304d47b71ec8b9f9c020d91eeaffa56bdef1402eefc2d4f2ad854eee0b00f5' 
  AND token = 'l9ifH6pHJB/+YkOc5gg4rXO49neSkhQR8P8a0vUpM5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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